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Transcription and Regulation

Transcription and Regulation
Transcription factors are

proteins which bind to DNA and regulate transcription
CATT boxes
TATA boxes
promoters

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Transcription and Regulation
Each tRNA molecule has a cloverleaf secondary structure consisting of

four stem loops
three stem loops
two stem loops
either (a) or (b)

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Transcription and Regulation
Promoters for tRNAs are located

upstream from the start codon
downstream from the start codon
none of these
both (a) and (b)

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Transcription and Regulation
Transcription begins

at the start codon
downstream from the start codon
none of these
upstream from the start codon

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Transcription and Regulation
In prokaryotes, transcription is

terminated by a poly A sequence
terminated by a start codon
terminated by a protein called rho
terminated by the stop codon

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Transcription and Regulation
The closed complex at bacterial promoters is

bound more tightly when repressors are present
not affected by activator proteins
in equilibrium with free RNA polymerase and the promoter
not affected by promoter mutations

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